SAT scores are distributed with a mean of 1,500 and a standard deviation of 306. You are interested in estimating the average SAT score of first year students at your college. If you would like to limit the margin of error of your confidence interval to 20 points with 90 percent confidence, how many students should you sample?  (Round up to a whole number of students.)

Q: You are conducting an experiment to examine the anxiety levels of a group of Psychology students.…

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Q: AT scores are distributed with a mean of 1,500 and a standard devieation of 287. You are interested…

A: Given that, Critical value: Using the z-table, the critical value at 85% confidence level is ,

Q: Choose a quantitative variable.  Measure it on two different samples of 10, drawn from two different…

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Q: You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based…

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Q: You are conducting a study to see how much high school students spend on back to school shopping.…

A: The sample size can be calculated as: n=z×σE2 Here, z = desired confidence level E = The allowable…

Q: You are conducting a survey of the total credit hours students take each semester at a college.…

A: Given,standard deviation (σ)=4.7margin of error (E)=1α=1-0.99=0.01α2=0.005Zα2 =Z0.005=2.58

Q: You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based…

A: Margin of error=1.5 Population standard deviations=31.6 Critical value =1.645

Q: You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based…

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Q: you want to obtain a sample to estimate a population mean. based on previous evidence, you believe…

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Q: SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested…

A: Critical value: The value of α is 0.05 for 95% confidence level. Using excel formula…

Q: SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested…

A:

Q: you want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based…

A: Population standard deviation =56.3Margin of error =E =1

Q: SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested…

A: Mean SAT score : μ = 1500Standard deviation of SAT score : σ = 300The margin of error for the 95%…

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A:

Q: You plan to build a 95% confidence interval estimate of the mean of a large population. You want a…

A: Givenconfidence level=95%Margin of error(E)=10standard deviation(σ)=200

Q: You are conducting a study to see how much high school students spend on back to school shopping.…

A: Solution: From the given information, confidence level is 0.90, σ=60.7 and E=1.